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Finding the Fourth Proportional to 768, 1,152.18 and 255

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Solution

The fourth proportional to 768, 1,152.18 and 255 is: 382.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    768 : 1,152.18 = 255 : x
  2. Step 2: Convert to fraction form
    768/1,152.18 = 255/x
  3. Step 3: Cross multiply
    768x = 1,152.18 × 255
  4. Step 4: Simplify right side
    768x = 293,805.90
  5. Step 5: Solve for x
    x = 293,805.90/768
  6. Step 6: Final answer
    x = 382.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.